Water cooling system for internal combustion engines, internal combustion engine, and method for modifying the water cooling system for internal combustion engines.

Abstract

The present invention provides a water cooling system for an internal combustion engine that can fully utilize the cooling performance of a cooler for cooling the components of the internal combustion engine and a heat exchanger for cooling the compressed gas introduced into the internal combustion engine. [Solution] The water cooling system for an internal combustion engine comprises a first circulation line through which first cooling water circulates, a cooler for cooling the components of the internal combustion engine with the first cooling water, a first heat exchanger for performing heat exchange between compressed gas introduced into the internal combustion engine and the first cooling water, a second circulation line through which second cooling water at a lower temperature than the first cooling water circulates, and a second heat exchanger for performing heat exchange between compressed gas that has passed through the first heat exchanger and the second cooling water. The first circulation line includes a component cooling line equipped with a cooler and a compressed gas cooling line provided in parallel with the component cooling line, and the first heat exchanger performs heat exchange between compressed gas and first cooling water flowing through the compressed gas cooling line.

Description

Technical Field

[0001] The present disclosure relates to a water cooling system for an internal combustion engine, an internal combustion engine including the water cooling system, and a method for retrofitting the water cooling system of an internal combustion engine.

Background Art

[0002] Some water cooling systems for internal combustion engines include a cooler (engine jacket, oil cooler) for cooling components of the internal combustion engine with cooling water, and a heat exchanger (air cooler) for cooling compressed gas introduced into the internal combustion engine. Patent Document 1 discloses cooling an engine jacket or the like with high-temperature side cooling water cooled by a high-temperature side radiator, and cooling an air cooler or the like with low-temperature side cooling water cooled by a low-temperature side radiator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described water cooling system for an internal combustion engine, when the flow rate of cooling water decreases due to an increase in the pressure loss of the cooling water system through which the cooling water flows, there is a possibility that the cooling performance of the cooler for cooling components of the internal combustion engine and the heat exchanger for cooling the compressed gas introduced into the internal combustion engine cannot be sufficiently exhibited.

[0005] In view of the above circumstances, at least one embodiment of the present disclosure aims to provide a water cooling system for an internal combustion engine that can sufficiently exhibit the cooling performance of a cooler for cooling components of the internal combustion engine and a heat exchanger for cooling the compressed gas introduced into the internal combustion engine.

Means for Solving the Problems

[0006] A water-cooling system for an internal combustion engine according to at least one embodiment of the present disclosure is: A water cooling system for an internal combustion engine, comprising the components of the internal combustion engine and the compressed gas supplied to the internal combustion engine, A first circulation line configured to circulate first coolant cooled by a first radiator, A cooler configured to cool the components of the internal combustion engine with the first cooling water flowing through the first circulation line, A first heat exchanger is configured to perform heat exchange between the compressed gas, which is compressed by a compressor and guided to the internal combustion engine, and the first cooling water flowing through the first circulation line. A second circulation line is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator, The system comprises a second heat exchanger configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger and the second cooling water flowing through the second circulation line, The first circulation line is, The cooling line for the components, in which the aforementioned cooler is provided, It includes a compressed gas cooling line provided in parallel with the aforementioned component cooling line, The first heat exchanger is configured to perform heat exchange between the compressed gas and the first cooling water flowing through the compressed gas cooling line. Water cooling system for internal combustion engines.

[0007] The internal combustion engine system according to at least one embodiment of the present disclosure is The water cooling system of the internal combustion engine, The aforementioned internal combustion engine, The system comprises the aforementioned compressor and

[0008] A method for modifying a water-cooling system for an internal combustion engine according to at least one embodiment of this disclosure is: A method for modifying a water cooling system for an internal combustion engine, which is used to cool the components of the internal combustion engine and the compressed gas supplied to the internal combustion engine, The water cooling system for the aforementioned internal combustion engine is A first circulation line configured to circulate first coolant cooled by a first radiator, A cooler configured to cool the components of the internal combustion engine with the first cooling water flowing through the first circulation line, A first heat exchanger is configured to perform heat exchange between the compressed gas, which is compressed by a compressor and guided to the internal combustion engine, and the first cooling water flowing through the first circulation line. A second circulation line is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator, The system comprises a second heat exchanger configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger and the second cooling water flowing through the second circulation line, The method for modifying the water cooling system of the internal combustion engine is as follows: A compressed gas cooling line addition step involves adding a compressed gas cooling line that is in parallel with the component cooling line in the first circulation line to which the cooler is provided, The system includes a first heat exchanger relocation step of moving the first heat exchanger, which is installed in series with the cooler in the aforementioned component cooling line, from the component cooling line to the compressed gas cooling line. [Effects of the Invention]

[0009] According to at least one embodiment of the present disclosure, a water cooling system for an internal combustion engine is provided that can fully utilize the cooling performance of a cooler for cooling the components of the internal combustion engine and a heat exchanger for cooling the compressed gas introduced into the internal combustion engine. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram illustrating the configuration of an internal combustion engine system equipped with a water cooling system for an internal combustion engine according to one embodiment of the present disclosure. [Figure 2] This is a schematic diagram illustrating the configuration of an internal combustion engine system equipped with a water-cooling system for an internal combustion engine, as described in the comparative example. [Figure 3]It is an explanatory diagram for explaining an orifice in a water cooling system of an internal combustion engine according to an embodiment of the present disclosure. [Figure 4] It is an explanatory diagram for explaining a modification example of the first component cooling line and the second component cooling line. [Figure 5] It is an explanatory diagram for explaining a modification example of the first component cooling line and the second component cooling line.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely illustrative examples.

[0012] (Water Cooling System of Internal Combustion Engine) FIG. 1 is a schematic configuration diagram schematically showing the configuration of an internal combustion engine system 10 including a water cooling system 1 of an internal combustion engine 2 according to an embodiment of the present disclosure. The water cooling system 1 of the internal combustion engine 2 is for cooling the components 3 of the internal combustion engine 2 and the compressed gas introduced into the internal combustion engine 2. As shown in FIG. 1, the water cooling system 1 of the internal combustion engine 2 includes a first circulation line 4, a second circulation line 5, a cooler 6, a first heat exchanger 7, and a second heat exchanger 8.

[0013] (First Circulation Line) As shown in FIG. 1, the first circulation line 4 is configured such that the first cooling water cooled by the first radiator 41 circulates. The first circulation line 4 is a flow path for circulating the first cooling water. The first circulation line 4 is provided with a first radiator 41 and a first pump 42 provided in the first circulation line 4 for sending the first cooling water in the first circulation line 4. Hereinafter, the flow direction of the first cooling water in the first circulation line 4 starts from the first cooling water discharge port 411 of the first radiator 41 (the upstream end). The first cooling water flows through the first circulation line 4 toward the downstream side in the flow direction of the first cooling water by driving the first pump 42.

[0014] The water cooling system 1 includes a first cooling device 40 for cooling the first cooling water. The first cooling device 40 is composed of a first radiator 41 and a first fan 43 for air-cooling the first radiator 41. The first cooling device 40 is configured to perform heat exchange between the air sent around the first radiator 41 by the first fan 43 and the first cooling water in the first radiator 41. The first cooling water in the first radiator 41 is air-cooled by the air around the first radiator 41.

[0015] (Second Circulation Line) As shown in FIG. 1, the second circulation line 5 is configured such that the second cooling water cooled by the second radiator 51 circulates. The second cooling water flowing through the second circulation line 5 is at a lower temperature than the first cooling water flowing through the first circulation line 4. The second circulation line 5 is a flow path for circulating the second cooling water. The second circulation line 5 is provided with a second radiator 51 and a second pump 52 provided in the second circulation line 5 for sending the second cooling water in the second circulation line 5. Hereinafter, the flow direction of the second cooling water in the second circulation line 5 starts from the second cooling water discharge port 511 of the second radiator 51 (upstream end). The second cooling water flows through the second circulation line 5 toward the downstream side in the flow direction of the second cooling water by driving the second pump 52.

[0016] The water cooling system 1 includes a second cooling device 50 for cooling the second cooling water. The second cooling device 50 is composed of a second radiator 51 and a second fan 53 for air-cooling the second radiator 51. The second cooling device 50 is configured to perform heat exchange between the air sent around the second radiator 51 by the second fan 53 and the second cooling water in the second radiator 51. The second cooling water in the second radiator 51 is air-cooled by the air around the second radiator 51.

[0017] (Cooler) The cooler 6 is configured to cool the components 3 of the internal combustion engine 2 with first cooling water flowing through the first circulation line 4. The first circulation line 4 includes a components cooling line 44 to which the cooler 6 is installed. The cooler 6 is configured to exchange heat between the first cooling water flowing through the components cooling line 44 and the components 3. The components 3 are water-cooled by the first cooling water in the cooler 6.

[0018] (1st heat exchanger, 2nd heat exchanger) The first heat exchanger (first air cooler) 7 is configured to exchange heat between compressed gas (e.g., compressed air) compressed by the compressor 11 and introduced to the internal combustion engine 2, and the first cooling water flowing through the first circulation line 4. The second heat exchanger (second air cooler) 8 is configured to exchange heat between compressed gas that has passed through the first heat exchanger 7 and the second cooling water flowing through the second circulation line 5.

[0019] As shown in Figure 1, the internal combustion engine system 10 comprises a water cooling system 1, an internal combustion engine 2 having a plurality of cylinders 21, a compressor 11 for compressing a combustion gas (e.g., air) to be introduced into the plurality of cylinders 21 of the internal combustion engine 2, and a compressed gas introduction line 12 which is a flow path for introducing the compressed gas compressed by the compressor 11 into the plurality of cylinders 21 of the internal combustion engine 2. The compressed gas introduction line 12 is provided with a first heat exchanger 7 and a second heat exchanger 8. The second heat exchanger 8 is located downstream of the first heat exchanger 7 in the compressed gas flow direction of the compressed gas introduction line 12.

[0020] The compressed gas compressed by the compressor 11 is heated and pressurized to a higher temperature than before it was introduced into the compressor 11. The compressed gas compressed by the compressor 11 is cooled by the first cooling water in the first heat exchanger 7, and then cooled by the second cooling water in the second heat exchanger 8. The compressed gas that has passed through the second heat exchanger 8 is then led to the internal combustion engine 2.

[0021] (Compressed gas cooling line) The first circulation line 4 includes a compressed gas cooling line 45, which is provided in parallel with the component cooling line 44, where the cooler 6 is located, as shown in Figure 1. The first heat exchanger 7 is provided in the compressed gas cooling line 45. The first heat exchanger 7 is configured to perform heat exchange between the compressed gas, which is compressed by the compressor 11 and led to the internal combustion engine 2, and the first cooling water flowing through the compressed gas cooling line 45.

[0022] In the illustrated embodiment, the first circulation line 4 branches into a component cooling line 44 and a compressed gas cooling line 45 at a branching section 401 located downstream of the first pump 42 in the flow direction of the first cooling water in the first circulation line 4. The component cooling line 44 and the compressed gas cooling line 45 merge at a confluence section 402 located downstream of the branching section 401 in the flow direction of the first cooling water in the first circulation line 4. The component cooling line 44 and the compressed gas cooling line 45 are respective passages through which the first cooling water flows, with the branching section 401 as the upstream end and the confluence section 402 as the downstream end.

[0023] In the illustrated embodiment, the confluence section 402 is located upstream of the first coolant inlet 412 of the first radiator 41 in the direction of the first coolant flow. However, it may also be located in the middle of the first radiator 41, that is, between the first coolant outlet 411 and the first coolant inlet 412 of the first radiator 41.

[0024] A portion of the first cooling water flowing through the first circulation line 4 is led to the component cooling line 44, where it cools the component 3 in the cooler 6 and is heated by the thermal energy recovered from the component 3. The remaining first cooling water flowing through the first circulation line 4 is led to the compressed gas cooling line 45, where it cools the compressed gas in the first heat exchanger 7 and is heated by the thermal energy recovered from the compressed gas.

[0025] (Water cooling system for an internal combustion engine in a comparative example) Figure 2 is a schematic diagram illustrating the configuration of an internal combustion engine system 010 equipped with a water cooling system 01 for an internal combustion engine 2 according to a comparative example. As shown in Figure 2, the water cooling system 01 for the internal combustion engine 2 according to the comparative example comprises a first circulation line 4, a second circulation line 5, a cooler 6, a first heat exchanger 7, and a second heat exchanger 8, similar to the water cooling system 1 shown in Figure 1. The water cooling system 01 for the internal combustion engine 2 according to the comparative example differs from the water cooling system 1 of this disclosure in that the first circulation line 4 does not include a compressed gas cooling line 45, and the first heat exchanger 7 is provided downstream of the cooler 6 in the first cooling water flow direction of the first circulation line 4 (component equipment cooling line 44).

[0026] In the comparative example water cooling system 01, a cooler 6 and a first heat exchanger 7 are provided in series in the first circulation line 4. In contrast, in the water cooling system 1 of the present disclosure, a cooler 6 and a first heat exchanger 7 are provided in parallel in the first circulation line 4. The water cooling system 1 of the present disclosure (see Figure 1) can reduce the overall pressure loss in the first circulation line 4 compared to the comparative example water cooling system 01 (see Figure 2).

[0027] If the components of the water cooling system 1 of this disclosure (see Figure 1) are the same as those of the water cooling system 01 of the internal combustion engine 2 of the comparative example (see Figure 2), and the rotational speed of the first pump 42 is kept the same, the water cooling system 1 of this disclosure reduces the pressure loss of the entire first circulation line 4, thereby increasing the discharge volume of the first pump 42 compared to the water cooling system 01 of the comparative example, and consequently increasing the flow rate of the first cooling water circulating in the first circulation line 4. By keeping the flow rate of the first cooling water circulating in the first circulation line 4 above a predetermined amount, the risk of cavitation generation in the first pump 42 can be reduced.

[0028] The water cooling system 1 of this disclosure can achieve a flow rate of first cooling water directed to the cooler 6 that is equal to or greater than that of the comparative example water cooling system 01. The flow rate of first cooling water directed to the cooler 6 has a relatively large impact on the heat recovery efficiency of the cooler 6. The water cooling system 1 of this disclosure can secure the required amount of first cooling water directed to the cooler 6, allowing the cooler 6 to fully demonstrate its cooling performance.

[0029] The water cooling system 1 of this disclosure can reduce the temperature (inlet temperature) of the first cooling water led to the first heat exchanger 7 compared to the water cooling system 01 of the comparative example, and can increase the temperature difference between the compressed gas and the first cooling water in the first heat exchanger 7, thereby increasing the amount of heat exchanged in the first heat exchanger 7. Here, the effect of the flow rate of the first cooling water led to the first heat exchanger 7 on the heat recovery efficiency of the first heat exchanger 7 is smaller than the effect of the temperature of the first cooling water on the heat recovery efficiency of the first heat exchanger 7. Even if the flow rate of the first cooling water led to the first heat exchanger 7 is greater than the required amount, the effect on the heat recovery efficiency of the first heat exchanger 7 is small. The water cooling system 1 of this disclosure can secure the required amount of flow rate of the first cooling water led to the first heat exchanger 7 by providing a compressed gas cooling line 45, and can allow the first heat exchanger 7 to fully demonstrate its cooling performance.

[0030] Furthermore, if the required amount of flow rate of the first cooling water supplied to the cooler 6 and the first heat exchanger 7 can be secured, the water cooling system 1 of this disclosure can also be made smaller than the water cooling system 01 of the comparative example, while suppressing a decrease in the cooling performance of the cooler 6 and the first heat exchanger 7, by making at least one of the first radiator 41 or the first pump 42 smaller.

[0031] In some embodiments of the water cooling system 1 for the internal combustion engine 2, as shown in Figure 1, the components 3 of the internal combustion engine 2 described above include an engine jacket 31 for cooling the cylinders 21 of the internal combustion engine 2. The engine jacket 31 forms an internal space surrounding the cylinders 21 in the internal combustion engine 2. In the illustrated embodiment, the engine jacket 31 constitutes part of the cooler 6, is provided in the component cooling line 44, and is cooled by first coolant introduced into the internal space. By cooling the engine jacket 31 with the first coolant in the cooler 6, the cylinders 21 of the internal combustion engine 2 can be cooled.

[0032] In some embodiments of the water cooling system 1 for the internal combustion engine 2, as shown in Figure 1, the components 3 of the internal combustion engine 2 described above further include an oil cooler 32 for cooling the lubricating oil of the internal combustion engine 2. The cooler 6 is configured to cool the engine jacket 31 with first coolant that has passed through the oil cooler 32.

[0033] As shown in Figure 1, the internal combustion engine system 10 includes a lubricating oil storage tank (e.g., an oil pan) 13 configured to store lubricating oil for the internal combustion engine 2, a lubricating oil circulation line 14 which is a passage for drawing out and circulating the circulating oil stored in the circulating oil storage tank 13, and a lubricating oil pump 15 provided in the lubricating oil circulation line 14 for supplying lubricating oil in the lubricating oil circulation line 14. The lubricating oil flows through the lubricating oil circulation line 14 downstream in the direction of lubricating oil flow by driving the lubricating oil pump 15.

[0034] In the illustrated embodiment, the oil cooler 32 constitutes part of the cooler 6 and is provided in the lubricating oil circulation line 14. The first cooling water introduced to the oil cooler 32 cools the circulating oil introduced to the oil cooler 32.

[0035] In the cooler 6, the oil cooler 32 is cooled by the first coolant, thereby cooling the lubricating oil of the internal combustion engine 2. The amount of thermal energy recovered by the first coolant from the oil cooler 32 (the increase in the temperature of the first coolant) is smaller than the amount of thermal energy recovered by the first coolant from the engine jacket 31 (the increase in the temperature of the first coolant). Therefore, by installing the oil cooler 32 upstream of the engine jacket 31 in the flow direction of the first coolant, the engine jacket 31 and the oil cooler 32 can be effectively cooled by the first coolant.

[0036] In some other embodiments, the cooler 6 may be composed of either the engine jacket 31 or the oil cooler 32.

[0037] (First bypass line, first thermostat) In some embodiments, the water cooling system 1 of an internal combustion engine 2, as shown in Figure 1, includes a first bypass line 46 and a first thermostat 47 for opening and closing the first bypass line 46. One end of the first bypass line 46 is connected downstream in the flow direction of the first coolant from the engine jacket 31 (the downstreammost component 3) of the component cooling line 44. The other end of the first bypass line 46 is connected upstream in the flow direction of the first coolant from the branching point 401 that branches the component cooling line 44 and the compressed gas cooling line 45 of the first circulation line 4. In the illustrated embodiment, the other end of the first bypass line 46 is connected upstream in the flow direction of the first coolant from the first pump 42 of the first circulation line 4. The first thermostat 47 is provided at the connection point between one end of the first bypass line 46 and the component cooling line 44. Since the flow rate of the first cooling water that can pass through the first thermostat 47 is limited, the flow path in which the first thermostat 47 is provided may be made into multiple parallel flow paths, and the first thermostat 47 may be provided in each of the multiple parallel flow paths.

[0038] The first thermostat 47 is configured such that the first coolant flowing upstream of the connection point with one side of the first bypass line 46 in the component cooling line 44 passes through either the first radiator 41 or the first bypass line 46. The first thermostat 47 is configured to open the flow path toward the first bypass line 46 and close the flow path toward the first radiator 41 when the temperature of the first coolant introduced into the first thermostat 47 is below a set temperature. Furthermore, the first thermostat 47 is configured to open the flow path toward the first radiator 41 and close the flow path toward the first bypass line 46 when the temperature of the first coolant introduced into the first thermostat 47 exceeds a set temperature.

[0039] The first thermostat 47 allows the first coolant that has passed through the engine jacket 31 (component 3) to be selectively directed to either the first radiator 41 or the first bypass line 46 depending on the temperature of the first coolant. The water cooling system 1 of the internal combustion engine 2 equipped with the first thermostat 47 can maintain the temperature of the first coolant flowing through the first circulation line 4 near a set temperature without requiring a dedicated thermostat to be installed downstream of the first heat exchanger 7 in the compressed gas cooling line 45 in the direction of the first coolant flow. By not installing the dedicated thermostat in the compressed gas cooling line 45, the water cooling system 1 of the internal combustion engine 2 can reduce the pressure loss in the compressed gas cooling line 45, thereby increasing the flow rate of the first coolant circulating through the first circulation line 4. Furthermore, by not installing the dedicated thermostat in the compressed gas cooling line 45, the water cooling system 1 of the internal combustion engine 2 can simplify the structure of the water cooling system 1 and reduce the manufacturing cost of the water cooling system 1.

[0040] A comparative example water cooling system 01 (see Figure 2) includes, similar to the water cooling system 1 of this disclosure, a first bypass line 046 and a first thermostat 047 for opening and closing the first bypass line 046. One side of the first bypass line 046 is connected downstream of the first heat exchanger 7 in the first cooling water flow direction of the first circulation line 4 (component equipment cooling line 44). The other side of the first bypass line 046 is connected upstream of the first pump 42 and cooler 6 in the first cooling water flow direction of the first circulation line 4 (component equipment cooling line 44).

[0041] (Second bypass line, second thermostat) In some embodiments, the water cooling system 1 of an internal combustion engine 2, as shown in Figure 1, includes a second bypass line 54 and a second thermostat 55 for opening and closing the second bypass line 54. One end of the second bypass line 54 is connected downstream of the second heat exchanger 8 of the second circulation line 5 in the direction of the flow of the second cooling water. The other end of the second bypass line 54 is connected upstream of the second heat exchanger 8 of the second circulation line 5 in the direction of the flow of the second cooling water. In the illustrated embodiment, the other end of the second bypass line 54 is connected upstream of the second pump 52 of the second circulation line 5 in the direction of the flow of the second cooling water. The second thermostat 55 is provided at the connection point between one end of the second bypass line 54 and the second circulation line 5. Since there is an upper limit to the flow rate of the second cooling water that can pass through the second thermostat 55, the flow path in which the second thermostat 55 is installed may be made into multiple parallel flow paths, and the second thermostat 55 may be installed in each of the multiple parallel flow paths.

[0042] The second thermostat 55 is configured such that the second coolant flowing upstream of the connection point with one side of the second bypass line 54 in the second circulation line 5 passes through either the second radiator 51 or the second bypass line 54. The second thermostat 55 opens the flow path toward the second bypass line 54 and closes the flow path toward the second radiator 51 when the temperature of the second coolant introduced into the second thermostat 55 is below the set temperature. The second thermostat 55 also opens the flow path toward the second radiator 51 and closes the flow path toward the second bypass line 54 when the temperature of the second coolant introduced into the second thermostat 55 exceeds the set temperature.

[0043] The second thermostat 55 allows the second coolant that has passed through the second heat exchanger 8 to be selectively directed to either the second radiator 51 or the second bypass line 54, depending on the temperature of the second coolant. The water cooling system 1 of the internal combustion engine 2 equipped with the second thermostat 55 can maintain the temperature of the second coolant flowing through the second circulation line 5 near a set temperature. If there is no thermostat downstream of the first heat exchanger 7 in the first circulation line 4 (compressed gas cooling line 45) in the flow direction of the first coolant, the warm-up of the internal combustion engine 2 when starting will be slow, and the temperature of the compressed gas after cooling may remain low. However, the temperature of the compressed gas after cooling by the first heat exchanger 7 and the second heat exchanger 8 is predominantly determined by the temperature of the second coolant flowing through the second circulation line 5. In other words, the temperature of the first coolant flowing through the first circulation line 4 is less sensitive to the temperature of the compressed gas after cooling by the second heat exchanger 8. By providing a second thermostat 55 in the second circulation line 5, the warm-up of the internal combustion engine 2 during startup can be accelerated, and supercooling of the compressed gas during startup can be suppressed. In such a water cooling system 1 for the internal combustion engine 2, it is not necessary to provide a dedicated thermostat downstream of the first heat exchanger 7 in the first cooling water flow direction in the compressed gas cooling line 45.

[0044] In some embodiments of the water cooling system 1 for the internal combustion engine 2, the flow rate of the first cooling water led to the compressed gas cooling line 45 described above is configured to be smaller than the flow rate of the first cooling water led to the component cooling line 44. To adjust the flow rate of the first cooling water flowing through the component cooling line 44 and the compressed gas cooling line 45, for example, the inner diameter of the piping constituting the component cooling line 44 and the compressed gas cooling line 45 may be adjusted. In one embodiment, when the discharge amount of the first pump 42 is defined as 100%, the flow rate of the compressed gas cooling line 45 is set to be between 20% and 40%.

[0045] In the cooler 6, the flow rate of the first cooling water supplied to the cooler 6 has a relatively large impact on the heat recovery efficiency of the cooler 6. In contrast, in the first heat exchanger 7, the flow rate of the first cooling water supplied to the first heat exchanger 7 has a relatively small impact on the heat recovery efficiency of the first heat exchanger 7. The water cooling system 1 of the internal combustion engine 2 can effectively utilize the cooling performance of the cooler 6 and the first heat exchanger 7 by relatively increasing the flow rate of the first cooling water supplied to the component cooling line 44 and relatively decreasing the flow rate of the first cooling water supplied to the compressed gas cooling line 45 in which the first heat exchanger 7 is installed.

[0046] (Orifice) Figure 3 is an explanatory diagram illustrating an orifice 101 in a water cooling system 1 for an internal combustion engine 2 according to one embodiment of the present disclosure. In some embodiments of the water cooling system 1 for an internal combustion engine 2, an orifice 101 (101A, 101B) is provided in at least one of a compressed gas cooling line 45 or a component cooling line 44, as shown in Figure 3. The orifice 101 has an opening that reduces the cross-sectional area of ​​the flow path compared to the rest of the flow path through which the orifice 101 is provided.

[0047] In the embodiment shown in Figure 3, the first circulation line 4 includes a pipe 102 that includes the portion constituting the branch section 401 described above, a pipe 103 on the component equipment cooling line 44 side connected to the pipe 102, and a pipe 104 on the compressed gas cooling line 45 side connected to the pipe 102. The orifice 101 includes a first orifice 101A installed between pipe 102 and pipe 103, and a second orifice 101B installed between pipe 102 and pipe 104. Note that the orifice 101 may consist of only either the first orifice 101A or the second orifice 101B. Furthermore, the orifice 101 may be provided in parts of the compressed gas cooling line 45 and the component equipment cooling line 44 other than those shown in Figure 3.

[0048] The water cooling system 1 of the internal combustion engine 2 can adjust the flow rate of the first cooling water supplied to the compressed gas cooling line 45 and the component cooling line 44, respectively, via the orifice 101, to an appropriate level. By adjusting the flow rate of the first cooling water supplied to the compressed gas cooling line 45 and the component cooling line 44, the water cooling system 1 of the internal combustion engine 2 can effectively maximize the cooling performance of the cooler 6 and the first heat exchanger 7.

[0049] (First component equipment cooling line, second component equipment cooling line) The internal combustion engine 2 in Figure 1 is schematically shown as viewed from above. In some embodiments, as shown in Figure 1, the internal combustion engine 2 described above has a first cylinder row 21A to which a plurality of cylinders 21 are arranged at intervals along a predetermined cylinder row direction (vertical direction in Figure 1), and a second cylinder row 21B to which a plurality of cylinders 21 are arranged offset from the first cylinder row 21A in a direction intersecting (orthogonal) to the cylinder row direction and are arranged at intervals along the cylinder row direction. The component cooling line 44 described above includes a first component cooling line 44A and a second component cooling line 44B provided in parallel with the first component cooling line 44A.

[0050] In the embodiment shown in Figure 1, the component cooling line 44 branches into a first component cooling line 44A and a second component cooling line 44B at a branching section 441 provided in the component cooling line 44. The first component cooling line 44A and the second component cooling line 44B merge at a confluence section 442 located downstream of the branching section 441 in the flow direction of the first cooling water.

[0051] Figures 4 and 5 are explanatory diagrams illustrating modified examples of the first component cooling line 44A and the second component cooling line 44B, respectively. In some embodiments, the first circulation line 4 may branch at the branching section 401 into the compressed gas cooling line 45, the first component cooling line 44A, and the second component cooling line 44B, as shown in Figure 4. In some embodiments, the first circulation line 4 may merge at the confluence section 402 into the compressed gas cooling line 45, the first component cooling line 44A, and the second component cooling line 44B, as shown in Figure 4.

[0052] The first circulation line 4 may include multiple branching sections 401 (401A, 401B) and multiple merging sections 402 (402A, 402B) if there are multiple component cooling lines 44 (44A, 44B). The first bypass line 46 is preferably connected upstream of the branching section 401 (401A, 401B) located furthest upstream in the flow direction of the first cooling water. In some embodiments, as shown in Figure 5, the first circulation line 4 branches at branching section 401A (401) of the first circulation line 4 into either the first component cooling line 44A or the second component cooling line 44B (in the illustrated example, the second component cooling line 44B) and a compressed gas cooling line 45. As shown in Figure 5, the first circulation line 4 may have a branch at branch 401B located downstream of branch 401A in the flow direction of the first cooling water, where the other component cooling line (first component cooling line 44A in the illustrated example) branches off from the compressed gas cooling line 45. In some embodiments, as shown in Figure 5, the first circulation line 4 has a confluence 402A (402) where the compressed gas cooling line 45 merges with either the first component cooling line 44A or the second component cooling line 44B (second component cooling line 44B in the illustrated example). As shown in Figure 5, the first circulation line 4 may have a branching section 402B located upstream of the confluence section 402A of the first circulation line 4 in the flow direction of the first cooling water, where the other component cooling line (in the illustrated example, the first component cooling line 44A) may merge with the compressed gas cooling line 45.

[0053] The first component cooling line 44A is provided with a first engine jacket 31A, which is an engine jacket 31 for cooling a plurality of cylinders 21 belonging to the first cylinder row 21A. The first engine jacket 31A forms an internal space surrounding the plurality of cylinders 21 belonging to the first cylinder row 21A. By cooling the first engine jacket 31A, the first cylinder row 21A can be cooled.

[0054] The second component cooling line 44B is provided with a second engine jacket 31B, which is an engine jacket 31 for cooling multiple cylinders 21 belonging to the second cylinder row 21B. The second engine jacket 31B forms an internal space surrounding the multiple cylinders 21 belonging to the second cylinder row 21B. By cooling the second engine jacket 31B, the second cylinder row 21B can be cooled.

[0055] The first cooling water cooled by the first radiator 41 can be directly supplied to the first component cooling line 44A and the second component cooling line 44B, respectively. In this case, the first engine jacket 31A and the second engine jacket 31B are water-cooled by the relatively low-temperature first cooling water, so that the multiple cylinders 21 belonging to the first cylinder row 21A and the multiple cylinders 21 belonging to the second cylinder row 21B can be effectively cooled.

[0056] In some embodiments, as shown in Figure 1, the oil cooler 32 described above includes a first oil cooler 32A provided upstream of the first engine jacket 31A in the flow direction of the first coolant in the first component cooling line 44A, and a second oil cooler 32B provided upstream of the second engine jacket 31B in the flow direction of the first coolant in the second component cooling line 44B. In the illustrated embodiment, the second oil cooler 32B is provided in parallel with the first oil cooler 32A in the lubricating oil circulation line 14. The lubricating oil circulation line 14 includes a passage to which the first oil cooler 32A is provided, and a passage that is parallel to the first oil cooler 32A and to which the second oil cooler 32B is provided. In this case, the first oil cooler 32A and the second oil cooler 32B are water-cooled by the first coolant at a relatively low temperature, so that the lubricating oil of the internal combustion engine 2 can be effectively cooled.

[0057] As shown in Figure 1, an internal combustion engine system 10 according to several embodiments comprises the water cooling system 1 described above, the internal combustion engine 2 described above, and the compressor 11 described above. An internal combustion engine system 10 equipped with the water cooling system 1 for the internal combustion engine 2 can fully utilize the cooling performance of the cooler 6 for cooling the components 3 of the internal combustion engine 2 and the first heat exchanger 7 for cooling the compressed gas introduced into the internal combustion engine 2.

[0058] A method for modifying the water cooling system 1 of an internal combustion engine 2 according to several embodiments is a method for modifying the water cooling system 01 of the internal combustion engine 2 shown in Figure 2 to the water cooling system 1 of the present disclosure shown in Figure 1. The method for modifying the water cooling system 1 of the internal combustion engine 2 includes a compressed gas cooling line addition step of adding a compressed gas cooling line 45 in parallel with the component cooling line 44 on which the cooler 6 of the first circulation line 4 is provided, and a first heat exchanger relocation step of moving the first heat exchanger 7, which is provided in series with the cooler 6 in the component cooling line 44, from the component cooling line 44 to the compressed gas cooling line 45. In the first heat exchanger relocation step, the first heat exchanger 7 is removed from the component cooling line 44, the component cooling line 44 from which the first heat exchanger 7 has been removed is reconnected, and the first heat exchanger 7 is installed in the compressed gas cooling line 45.

[0059] The modified water cooling system 1 (see Figure 1) reduces the overall pressure loss in the first circulation line 4 compared to the pre-modification water cooling system 01 (see Figure 2), in which the cooler 6 and the first heat exchanger 7 were connected in series. This allows for an increase in the flow rate of the first cooling water circulating in the first circulation line 4. The modified water cooling system 1 of the internal combustion engine 2 can ensure the necessary flow rate of the first cooling water supplied to the cooler 6 and the first heat exchanger 7, respectively, allowing the cooler 6 and the first heat exchanger 7 to fully utilize their cooling performance.

[0060] In this specification, expressions describing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" shall not only describe such arrangements strictly, but also describe states of relative displacement with tolerances or angles or distances that allow for the same function to be achieved. For example, expressions such as "identical," "equal," and "homogeneous" that describe things being in an equal state not only describe a state of being strictly equal, but also describe a state in which there is a tolerance or a difference that is sufficient to achieve the same function. Furthermore, in this specification, expressions describing shapes such as quadrilaterals and cylindrical shapes shall not only represent geometrically precise quadrilaterals and cylindrical shapes, but also shapes that include uneven surfaces, chamfered surfaces, etc., to the extent that the same effect can be achieved. Furthermore, in this specification, the expressions “equipment,” “includes,” or “possess” of a component are not exclusive expressions that exclude the existence of other components.

[0061] This disclosure is not limited to the embodiments described above, but also includes modified forms of the embodiments described above, as well as forms that combine these forms as appropriate.

[0062] The contents described in some of the embodiments above can be understood, for example, as follows:

[0063] 1) The water cooling system (1) of an internal combustion engine (2) according to at least one embodiment of the present disclosure is: A water cooling system (1) for an internal combustion engine (2) for cooling the components (3) of the internal combustion engine (2) and the compressed gas introduced into the internal combustion engine, A first circulation line (4) configured to circulate first coolant cooled by a first radiator (41), A cooler (6) configured to cool the components (3) of the internal combustion engine (2) with the first cooling water flowing through the first circulation line (4), A first heat exchanger (7) is configured to perform heat exchange between the compressed gas, which is compressed by the compressor (11) and led to the internal combustion engine (2), and the first cooling water flowing through the first circulation line (4), A second circulation line (5) is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator (51), The system includes a second heat exchanger (8) configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger (7) and the second cooling water flowing through the second circulation line (5), The first circulation line (4) is, The cooling line (44) for the components is provided with the aforementioned cooler (6), It includes a compressed gas cooling line (45) provided in parallel with the aforementioned component cooling line (44), The first heat exchanger (7) is configured to perform heat exchange between the compressed gas and the first cooling water flowing through the compressed gas cooling line (45).

[0064] According to the configuration described in 1) above, the water cooling system (1) of the internal combustion engine (2) can reduce the overall pressure loss in the first circulation line (4) compared to the case where the cooler (6) and the first heat exchanger (7) are installed in series, by installing the compressed gas cooling line (45) equipped with the first heat exchanger (7) in parallel with the component cooling line (44) equipped with the cooler (6). This allows for an increase in the flow rate of the first cooling water circulating in the first circulation line (4). The water cooling system (1) of the internal combustion engine (2) can secure the necessary flow rate of the first cooling water supplied to the cooler (6) and the first heat exchanger (7), respectively, and allow the cooler (6) and the first heat exchanger (7) to fully demonstrate their cooling performance.

[0065] 2) In some embodiments, the water cooling system (1) of the internal combustion engine (2) described in 1) above, The aforementioned component (3) includes an engine jacket (31) for cooling the cylinders (21) of the internal combustion engine (2).

[0066] According to the configuration described in 2) above, the cylinders (21) of the internal combustion engine (2) can be cooled by cooling the engine jacket (31) with the first coolant in the cooler (6).

[0067] 3) In some embodiments, the water cooling system (1) of the internal combustion engine (2) described in 2) above, The aforementioned component (3) further includes an oil cooler (32) for cooling the lubricating oil of the internal combustion engine (2), The cooler (6) is configured to cool the engine jacket (31) with the first coolant that has passed through the oil cooler (32).

[0068] According to the configuration described in 3) above, the lubricating oil of the internal combustion engine (2) can be cooled by cooling the oil cooler (32) with the first coolant in the cooler (6). The amount of thermal energy recovered by the first coolant from the oil cooler (32) (amount of temperature increase of the first coolant) is smaller than the amount of thermal energy recovered by the first coolant from the engine jacket (31) (amount of temperature increase of the first coolant). For this reason, by placing the oil cooler (32) upstream of the engine jacket (31) in the flow direction of the first coolant, the engine jacket (31) and the oil cooler (32) can be effectively cooled by the first coolant.

[0069] 4) In some embodiments, the water cooling system (1) of the internal combustion engine (2) described in 2) or 3) above, A first bypass line (46) connects the downstream side of the component cooling line (44) from the engine jacket (31) to the upstream side of the branching section (401) that branches off the component cooling line (44) from the first circulation line (4) to the compressed gas cooling line (45), The system further comprises a first thermostat (47) for opening and closing the first bypass line (46).

[0070] According to the configuration of 4) above, the first thermostat (47) can selectively guide the first coolant that has passed through the engine jacket (31) to either the first radiator (41) or the first bypass line (46) depending on the temperature of the first coolant. The water cooling system (1) of the internal combustion engine (2) equipped with the first thermostat (47) can maintain the temperature of the first coolant flowing through the first circulation line (4) near a set temperature without having to provide a dedicated thermostat downstream of the first heat exchanger (7) in the compressed gas cooling line (45) in the direction of the first coolant flow. By not providing the dedicated thermostat in the compressed gas cooling line (45), the water cooling system (1) of the internal combustion engine (2) can reduce the pressure loss in the compressed gas cooling line (45), thereby increasing the flow rate of the first coolant circulating through the first circulation line (4). Furthermore, by not providing the dedicated thermostat mentioned above in the compressed gas cooling line (45), the water cooling system (1) of the internal combustion engine (2) can have a simpler structure and reduce the manufacturing cost of the water cooling system (1).

[0071] 5) In some embodiments, the water cooling system (1) of the internal combustion engine (2) described in 4) above, A second bypass line (54) connects the downstream side of the second heat exchanger (8) of the second circulation line (5) to the upstream side of the second heat exchanger (8) of the second circulation line (5), The system further includes a second thermostat (55) for opening and closing the second bypass line (54).

[0072] According to the configuration of 5) above, the second thermostat (55) can selectively guide the second coolant that has passed through the second heat exchanger (8) to either the second radiator (51) or the second bypass line (54) depending on the temperature of the second coolant. The water cooling system (1) of the internal combustion engine (2) equipped with the second thermostat (55) can maintain the temperature of the second coolant flowing through the second circulation line (5) near a set temperature. By providing the second thermostat (55) in the second circulation line (5), the warm-up of the internal combustion engine (2) during startup can be accelerated, and supercooling of the compressed gas during startup can be suppressed. In such a water cooling system (1) of the internal combustion engine (2), it is not necessary to provide a dedicated thermostat downstream of the first heat exchanger (7) in the first coolant flow direction of the compressed gas cooling line (45).

[0073] 6) In some embodiments, a water cooling system (1) for an internal combustion engine (2) as described in any of 2) to 5) above, The flow rate of the first cooling water led to the compressed gas cooling line (45) is configured to be smaller than the flow rate of the first cooling water led to the component cooling line (44).

[0074] According to the configuration described in 6) above, the flow rate of the first cooling water supplied to the cooler (6) has a relatively large impact on the heat recovery efficiency of the cooler (6). In contrast, the flow rate of the first cooling water supplied to the first heat exchanger (7) has a relatively small impact on the heat recovery efficiency of the first heat exchanger (7). The water cooling system (1) of the internal combustion engine (2) can effectively utilize the cooling performance of the cooler (6) and the first heat exchanger (7) by relatively increasing the flow rate of the first cooling water supplied to the component cooling line (44) and relatively decreasing the flow rate of the first cooling water supplied to the compressed gas cooling line (45) where the first heat exchanger (7) is installed.

[0075] 7) In some embodiments, the water cooling system (1) of the internal combustion engine (2) described in 6) above, The system includes an orifice (101) provided in at least one of the compressed gas cooling line (45) or the component cooling line (44).

[0076] According to the configuration described in 7) above, the water cooling system (1) of the internal combustion engine (2) can adjust the flow rate of the first cooling water supplied to the compressed gas cooling line (45) and the component cooling line (44) via the orifice (101) to an appropriate amount. By adjusting the flow rate of the first cooling water supplied to the compressed gas cooling line (45) and the component cooling line (44) to an appropriate amount, the water cooling system (1) of the internal combustion engine (2) can effectively utilize the cooling performance of the cooler (6) and the first heat exchanger (7).

[0077] 8) In some embodiments, a water cooling system (1) for an internal combustion engine (2) as described in any of 2) to 7) above, The internal combustion engine (2) is A first cylinder row (21A) to which a plurality of cylinders (21) arranged at intervals along a predetermined cylinder row direction belong, The system includes a second cylinder row (21B) to which a plurality of cylinders (21) are arranged at an offset from the first cylinder row (21A) in a direction intersecting the cylinder row direction and spaced apart along the cylinder row direction, The aforementioned component cooling line (44) is A first component cooling line (44A) is provided with a first engine jacket (31A), which is the engine jacket (31) for cooling a plurality of cylinders (21) belonging to the first cylinder row (21A), The system includes a second component cooling line (44B) provided with a second engine jacket (31B), which is the engine jacket (31) for cooling a plurality of cylinders (21) belonging to the second cylinder row (21B).

[0078] According to the configuration described in 8) above, the first coolant cooled by the first radiator (41) can be directly supplied to the first component cooling line (44A) and the second component cooling line (44B), respectively. In this case, the first engine jacket (31A) and the second engine jacket (31B) are water-cooled by the relatively low temperature first coolant, so that multiple cylinders (21) belonging to the first cylinder row (21A) and multiple cylinders (21) belonging to the second cylinder row (21B) can be effectively cooled.

[0079] 9) An internal combustion engine system (10) according to at least one embodiment of the present disclosure is: A water-cooling system (1) of an internal combustion engine (2) as described in any of items 1) to 8) above, The internal combustion engine (2) and, The system comprises the aforementioned compressor (11) and

[0080] According to the configuration described in 9) above, the internal combustion engine system (10) equipped with a water cooling system (1) for the internal combustion engine (2) can fully utilize the cooling performance of the cooler (6) for cooling the components (3) of the internal combustion engine (2) and the heat exchanger (first heat exchanger 7) for cooling the compressed gas introduced into the internal combustion engine (2).

[0081] 10) A method for modifying the water cooling system (1) of an internal combustion engine (2) according to at least one embodiment of the present disclosure is: A method for modifying the components (3) of an internal combustion engine (2) and a water cooling system (1) for the internal combustion engine (2) for cooling the compressed gas introduced into the internal combustion engine (2), The water cooling system (1) of the internal combustion engine (2) is A first circulation line (4) configured to circulate first coolant cooled by a first radiator (41), A cooler (6) configured to cool the components (3) of the internal combustion engine (2) with the first cooling water flowing through the first circulation line (4), A first heat exchanger (7) is configured to perform heat exchange between the compressed gas, which is compressed by the compressor (11) and led to the internal combustion engine (2), and the first cooling water flowing through the first circulation line (4), A second circulation line (5) is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator (51), The system includes a second heat exchanger (8) configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger (7) and the second cooling water flowing through the second circulation line (5), The method for modifying the water cooling system (1) of the internal combustion engine (2) is as follows: A compressed gas cooling line addition step involves adding a compressed gas cooling line (45) in parallel with the component cooling line (44) of the first circulation line (4) to which the cooler (6) is provided, The system includes a first heat exchanger relocation step of moving the first heat exchanger (7), which is installed in series with the cooler (6) in the component cooling line (44), from the component cooling line (44) to the compressed gas cooling line (45).

[0082] According to the method described in 10) above, the water cooling system (1) of the modified internal combustion engine (2) reduces the overall pressure loss in the first circulation line (4) compared to the water cooling system (01) of the internal combustion engine (2) before modification, in which the cooler (6) and the first heat exchanger (7) are connected in series, by providing the compressed gas cooling line (45) equipped with the first heat exchanger (7) in parallel with the component cooling line (44) equipped with the cooler (6). This increases the flow rate of the first cooling water circulating in the first circulation line (4). The water cooling system (1) of the modified internal combustion engine (2) can secure the required amount of flow rate of the first cooling water supplied to the cooler (6) and the first heat exchanger (7), respectively, and allows the cooler (6) and the first heat exchanger (7) to fully demonstrate their cooling performance. [Explanation of Symbols]

[0083] 1.01 Water Cooling System 2 Internal Combustion Engine 3 Components 4. First circulation line 5. Second circulation line 6 Cooler 7 First heat exchanger 8 Second heat exchanger 10,010 Internal Combustion Engine Systems 11 Compressor 12 Compressed gas introduction line 13 Lubricating oil storage tank 14 Lubrication oil circulation line 15 Lubricating oil pump 21 cylinders 40 1st cooling device 41. Radiator 1 42 Pump No. 1 43 First Fan 44. Component equipment cooling lines 45 Compressed gas cooling line 50 Second cooling device 51. Second radiator 52 Pump No. 2 53 Second Fan 101 Orifice

Claims

1. A water cooling system for an internal combustion engine, comprising the components of the internal combustion engine and the compressed gas supplied to the internal combustion engine, A first circulation line configured to circulate first coolant cooled by a first radiator, A cooler configured to cool the components of the internal combustion engine with the first cooling water flowing through the first circulation line, A first heat exchanger is configured to perform heat exchange between the compressed gas, which is compressed by a compressor and guided to the internal combustion engine, and the first cooling water flowing through the first circulation line. A second circulation line is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator, The system comprises a second heat exchanger configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger and the second cooling water flowing through the second circulation line, The first circulation line is, The cooling line for the components, in which the aforementioned cooler is provided, It includes a compressed gas cooling line provided in parallel with the aforementioned component cooling line, The first heat exchanger is configured to perform heat exchange between the compressed gas and the first cooling water flowing through the compressed gas cooling line. Water cooling system for internal combustion engines.

2. The aforementioned components include an engine jacket for cooling the cylinders of the internal combustion engine. A water cooling system for an internal combustion engine according to claim 1.

3. The aforementioned components further include an oil cooler for cooling the lubricating oil of the internal combustion engine. The cooler is configured to cool the engine jacket with the first coolant that has passed through the oil cooler. A water cooling system for an internal combustion engine according to claim 2.

4. A first bypass line connects the downstream side of the component cooling line beyond the engine jacket and the upstream side of the branching point where the first circulation line branches into the component cooling line and the compressed gas cooling line. The system further comprises a first thermostat for opening and closing the first bypass line, A water cooling system for an internal combustion engine according to claim 2 or 3.

5. A second bypass line connects the downstream side of the second circulation line to the upstream side of the second heat exchanger, The system further comprises a second thermostat for opening and closing the second bypass line, A water cooling system for an internal combustion engine according to claim 4.

6. The flow rate of the first cooling water led to the compressed gas cooling line is configured to be smaller than the flow rate of the first cooling water led to the component cooling line. A water cooling system for an internal combustion engine according to claim 2 or 3.

7. The system includes an orifice provided in at least one of the compressed gas cooling line or the component cooling line. A water-cooling system for an internal combustion engine according to claim 6.

8. The aforementioned internal combustion engine is A first cylinder row to which multiple cylinders are arranged at intervals along a predetermined cylinder row direction, It has a second cylinder row to which a plurality of cylinders are arranged at intervals along the cylinder row direction, and which are offset from the first cylinder row in a direction intersecting the cylinder row direction. The aforementioned cooling line for the component equipment is A first component cooling line is provided with the first engine jacket, which is the engine jacket for cooling a plurality of cylinders belonging to the first cylinder row, A second component cooling line is provided with a second engine jacket, which is the engine jacket for cooling a plurality of cylinders belonging to the second cylinder row, A water cooling system for an internal combustion engine according to claim 2 or 3.

9. A water cooling system for an internal combustion engine according to any one of claims 1 to 3, The aforementioned internal combustion engine, The compressor comprises, Internal combustion engine system.

10. A method for modifying a water cooling system for an internal combustion engine, which is used to cool the components of the internal combustion engine and the compressed gas supplied to the internal combustion engine, The water cooling system for the aforementioned internal combustion engine is A first circulation line configured to circulate first coolant cooled by a first radiator, A cooler configured to cool the components of the internal combustion engine with the first cooling water flowing through the first circulation line, A first heat exchanger is configured to perform heat exchange between the compressed gas, which is compressed by a compressor and guided to the internal combustion engine, and the first cooling water flowing through the first circulation line. A second circulation line is configured to circulate second coolant, which is at a lower temperature than the first coolant cooled by the second radiator, The system comprises a second heat exchanger configured to perform heat exchange between the compressed gas that has passed through the first heat exchanger and the second cooling water flowing through the second circulation line, The method for modifying the water cooling system of the internal combustion engine is as follows: A compressed gas cooling line addition step involves adding a compressed gas cooling line that is in parallel with the component cooling line in the first circulation line to which the cooler is provided, The system includes a first heat exchanger relocation step of moving the first heat exchanger, which is installed in series with the cooler in the aforementioned component cooling line, from the component cooling line to the compressed gas cooling line. How to modify the water cooling system of an internal combustion engine.

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